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The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope , which is a projector used for projecting images of transparent objects (such as films), and from the epidiascope , which is capable of projecting images of both ...
The first large-format slide projectors were built in the middle of the 20th century as background projectors for theaters and opera houses. From the early 50', the german Brand Reiche&Vogel was offering in a catalog a 2000w slide projector using 4.75"x 4.75" (12x12cm) slide or a scroller for film strip of the same size.
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Slide projector light generation and collimation system: from left to right, mirror / reflector, bulb, condenser lens 1, green-tinted heat-absorbing glass, condenser lens 2; a centrifugal fan, used to cool the bulb, is visible at the top of the picture. A projector has three main optical elements: [3]: 39–40
(Photo: Amazon) (Photo: Amazon) This projector-slash-night light has an army of devoted fans at Amazon. "This has to be one of the coolest purchases I have made," a f ive-star rev ie wer said.
The Slide Cube Projector is a slide projector and system, manufactured and marketed by Bell & Howell, which was introduced in 1970 and marketed through the 1980s.The projector derived its name from its transparent cubical plastic slide storage magazine, approximately 5.5 cm (2.2 in) in each dimension (a bit larger than a standard 135 film slide mount), that held 36 to 44 slides, depending on ...